#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let array = core::array::from_fn(|i| i);
    assert_eq!(array, [0, 1, 2, 3, 4]);
    let array2: [usize; 8] = core::array::from_fn(|i| i * 2);
    assert_eq!(array2, [0, 2, 4, 6, 8, 10, 12, 14]);
    let bool_arr = core::array::from_fn::<_, 5, _>(|i| i % 2 == 0);
    assert_eq!(bool_arr, [true, false, true, false, true]);
}